Diaphragm pump



FIG. 1 is a front isometric view of a diaphragm pump showing our new design;

FIG. 2 is a front view;

FIG. 3 is a left side view;

FIG. 4 is a rear view;

FIG. 5 is a right side view;

FIG. 6 is a top view; and,

FIG. 7 is a bottom view. 

CLAIM An ornamental design for a diaphragm pump, as shown and described. 